Editing Atira asteroid (section)

==Orbits==

Atiras do not cross Earth's orbit and are not immediate [[impact event]] threats, but their orbits may be [[Perturbation (astronomy)|perturbed]] outward by a close approach to either Mercury or Venus and become Earth-crossing asteroids in the future. The dynamics of many Atira asteroids resemble the one induced by the [[Kozai mechanism|Kozai-Lidov mechanism]],{{efn|Namely, they have coupled [[oscillations]] in orbital [[orbital eccentricity|eccentricity]] and [[orbital inclination|inclination]]}} which contributes to enhanced long-term orbital stability, since there is no [[libration]] of the perihelion.<ref name=FuenteMarcos20190611>{{cite journal |last1=de la Fuente Marcos |first1=Carlos |last2=de la Fuente Marcos |first2=Raúl |date=11 June 2018 |title=Kozai--Lidov Resonant Behavior Among Atira-class Asteroids |journal=[[Research Notes of the AAS]] |volume=2 |issue=2 |pages=46 |arxiv=1806.00442 |bibcode=2018RNAAS...2...46D |doi=10.3847/2515-5172/aac9ce|s2cid=119239031 |doi-access=free }}</ref><ref name=FuenteMarcos20190801>{{cite journal |last1=de la Fuente Marcos |first1=Carlos |last2=de la Fuente Marcos |first2=Raúl |date=1 August 2019 |title=Understanding the evolution of Atira-class asteroid 2019 AQ<sub>3</sub>, a major step towards the future discovery of the Vatira population|journal=[[Monthly Notices of the Royal Astronomical Society]] |volume= 487|issue= 2|pages= 2742–2752|url = https://academic.oup.com/mnras/article-abstract/487/2/2742/5498309|arxiv=1905.08695|bibcode=2019MNRAS.487.2742D|doi=10.1093/mnras/stz1437|doi-access=free |s2cid=160009327 }}</ref>